1. Department of Mathematics and Statistics, King Fahad University of Petroleum and Minerals, Dhahran, Saudi Arabia
2. Department of Mathematics, University of Hafr Al Batin, Hafr Al Batin, Saudi Arabia
3. Department of Chemical Engineering, College of Engineering, University of Hafr Al Batin, Hafr Al Batin, Saudi Arabia
4. Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt